Abstract

This thesis consists of two principal sections. The first deals with studies on the phenomenon of Meiotic Drive. This includes a reading thesis, which is largely a review of the current literature on the subject. Results of research on the effect of temperature on Meiotic Drive are presented. Two stocks of D. melanogaster showing Segregation Disorder (SD)and Nonrandom Segregation were used.The second section deals with the cytogenetics of supremacy (B) chromosone found in the local population of short-horned grasshopper, Phaulacridium vitattum. The study include an estimation of the frequency of B chromosone carriers in the female population, distortal segregation of the B with respect to the X chromosomes, and also the influence of B chromosomes on chiasma formation.

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